practical #3: muscle functions

masseter origin

zygomatic arch

masseter insertion

ramus of mandible

masseter action

closes mandible

temporalis origin

temporal fossa

temporalis insertion

ramus of mandible

temporalis action

closes mandible

sternocleidomastoid origin

clavicle

sternocleidomastoid insertion

mastoid process of temporal bone

sternocleidomastoid action

rotates head

trapezius origin

posterior occipital bone

trapezius insertion

clavicle

trapezius action

rotates scapula

latissimus dorsi origin

iliac crest

latissimus dorsi insertion

intertubercular sulcus of humerus

latissimus dorsi action

medially rotates humerus

pectoralis major origin

costal cartilage of ribs 1-7

pectoralis major insertion

intertubercular sulcus of humerus

pectoralis major action

medially rotates humerus

pectoralis minor origin

costal cartilage of ribs 3-5

pectoralis minor insertion

coracoid process of scapula

pectoralis minor action

draws scapula laterally forward

rectus abdominis origin

pubic crest

rectus abdominis insertion

xiphoid process of sternum

rectus abdominis action

compress abdominal wall

zygomaticus major origin

zygomatic bone

zygomaticus major insertion

superolateral angle of mouth

zygomaticus major action

elevates corner of mouth

buccinator action

compresses cheek

frontal belly of occipitofrontalis action

raise eyebrows

diaphragm action

inspiration

occipital belly of occipitofrontalis action

retract scalp

mentalis action

protrudes lower lip

orbicularis oris action

protrudes lip

orbicularis oculi action

closes eyelids

external intercostals action

elevates ribs

internal intercostals action

elevates ribs

external oblique action

compress abdominal wall

internal oblique action

compress abdominal wall

serratus anterior action

draws scapula laterally and forward

transverse abdominis action

compress abdominal wall

zygomaticus minor action

elevates corner of mouth

deltoid origin

clavicle

deltoid insertion

deltoid tuberosity of humerus

deltoid action

flex arm

biceps brachii origin

glenoid cavity of scapula

biceps brachii insertion

radial tuberosity

biceps brachii action

flexes arm

brachioradialis origin

distal end of humerus

brachioradialis insertion

styloid process of radius

brachioradialis action

flexes forearm

teres major origin

inferior angle of scapula

teres major insertion

intertubercular sulcus of humerus

teres major action

medially rotates humerus

triceps brachii origin

glenoid cavity of scapula

triceps brachii insertion

ulnar tuberosity

triceps brachii action

extends elbow

infraspinatus origin

infraspinous fossa of scapula

infraspinatus insertion

greater tubercle of humerus

infraspinatus action

help stabilize shoulder joint

suprasinatus origin

supraspinous fossa of scapula

supraspinatus insertion

greater tubercle of humerus

supraspinatus action

help stabilize shoulder joint

teres minor origin

lateral border of scapula

teres minor insertion

greater tubercle of humerus

teres minor action

help stabilize shoulder joint

subscapularis origin

subscapular fossa of scapula

subscapularis insertion

lesser tubercle of humerus

subscapularis action

help stabilize shoulder joint

brachialis action

flexes forearm; prime mover of elbow flexion

extensor digitorum action

extend fingers

palmaris longus action

weakly flexes hand

flexor carpi ulnaris action

flexes wrist

biceps femoris origin

ischial tuberosity

biceps femoris insertion

head of fibula

biceps femoris action

flexes knee

semitendinosus origin

ischial tuberosity

semitendinosus insertion

proximal tibia

semitendinosus action

flexes knee

semimembranosus origin

ischial tuberosity

semimembranosus insertion

medial condyle of tibia

semimembranosus action

flexes knee

iliacus origin

iliac crest

iliacus insertion

lesser trochanter of femur

iliacus action

flexes thigh

psoas major origin

transverse process of thoracic 12 to lumbar 5 vertebrae

psoas major insertion

lesser trochanter of femur

psoas major action

flexes thigh

rectus femoris origin

spine of ilium

rectus femoris insertion

tibial tuberosity

rectus femoris action

extend knee

vastus intermedius origin

greater trochanter of femur

vastus intermedius insertion

tibial tuberosity

vastus intermedius action

extend knee

vastus lateralis origin

greater trochanter of femur

vastus lateralis insertion

tibial tuberosity

vastus lateralis action

extend knee

vastus medius origin

greater trochanter of femur

vastus medius insertion

tibial tuberosity

vastus medius action

extend knee

gluteus maximus origin

iliac crest